Transmitter Series EC 28 - | GfG Instrumentation [BGV B6 – previously VBG ... Transmitter may only be opened when the electrical power is switched off. If the transmitter is not

Worldwide Manufacturer of Gas Detection Solutions

Transmitter Series

EC 28 Operation Manual

Contents

For Your Safety 3

Operating Information 3

General Description 4

Measuring Method 4

Transmitter Parts 5

Place of Transmitter Installation 6

Installation 7

Installing the Electrical Connections 7

Putting into Operation 8

Measuring Mode 9

Measuring Range Underflow 9

Measuring Range Overflow 9

Checking and AutoCal Adjustment of Zeropoint (ZERO) 11

Checking and AutoCal Adjustment of the Sensitivity (SPAN) 13

Service Menu and Extended Service Menu 14

Organisation of the Service Menu 16

Sensor Replacement 19

Transmission Properties 20

Indications and Messages 20

Indications of Special Conditions and Malfunctions 20

Indications in Measuring Mode 22

Indications in Service Mode and During Calibration 23

Conditions of Status LED’s and Current Output 24

Priority of Indications and Messages in Measuring Mode 24

First Putting Into Operation and Maintenance 24

Service, Maintenance, Calibration and Adjustment 25

Regular Functional Checks 25

Repair 25

Fault – Cause – Remedy 25

Accessories 26

Connectors and Terminal Assignment 26

Measured gases and measuring ranges 27

Sensor specification 28

Internal Parameter Memory of the EC28 31

Technical Data – Part 1 32

Technical Data – Part 2 33

EC Type-Examination Certificate 34

– 3 –

For Your Safety

In accordance with Section 3 of the German Act on Technical Equipment, this Operating Manual draws

attention to the intended use of the product and serves for the avoidance of danger. It must be read and

observed by all persons who install, use, service, maintain or check this product. This product can only fulfil

its tasks, i.e. its intended function, if it is installed, used, serviced, maintained and checked in accordance

with the instructions of the manufacturer, i.e. GfG Gesellschaft für Gerätebau.

The warranty given by GfG is void if the product is not installed, used, serviced, maintained and checked in

accordance with the instructions of GfG. The above does not affect the warranty and liability provisions in

GfG’s General Conditions of Sale and Delivery.

Operating Information

Gas detectors must be checked for correct functioning by a qualified person after the installation but before

the start of the measuring operation (putting into operation) pursuant to national regulations. The applicable

regulation for this in Germany is Section 56(2) of the German Accident Prevention Rules for Gas (UVV

Gase [BGV B6 – previously VBG 61]).

The transmitter was checked for correct functioning and indication prior to delivery. The calibration was

performed with suitable calibration gases. This does not release the user from the obligation to perform a

check with test gas when the transmitter is put into operation after the installation.

The EC28 transmitter (and the derivatives mentioned below) is approved for use in explosion hazard zones

and has an EC Type-Examination Certificate from ‘EXAM BBG Prüf- und Zertifizier GmbH’, in accordance

with Directive 94/9/EC (ATEX100a).

Applicable for the EC28, EC28 D, EC28 DA, EC28 DAR, EC28 B, EC28 DB and EC28 DAB is:

Certificate: BVS 04 ATEX E 132 X

Marking: II 2G EEx em [ib] IIC T4 -20°C Ta +50°C

Applicable for the EC28 i and EC28 Di is:

Certificate: BVS 04 ATEX E 132 X

Marking: II 1G EEx ia IIC T4 -20°C Ta +50°C

!WARNINGThe supply voltage must not exceed 30V DC! This also applies for

voltage spikes!

– 4 –

General Description

A stationary gas detection system consists of a transmitter and an evaluation unit, i.e. GMA controller (not

included in the scope of supply). The transmitter and the controller are interconnected with a telemetry cable.

The transmitter converts the gas concentration into an electric measurement signal and transmits it via the

telemetry cable for processing to the controller.

The EC28 D transmitter differs from the EC28 transmitter in that it has an additional display; the EC28 DA

transmitter has both a display and a visual and audible alarm output.

The comprehensive electronics performs many tasks that make the operating and maintenance easier and

significantly increase the operational reliability and measuring accuracy. The transmitter has the following

features:

• Concentration indication on display or control unit

• Adjustments via push button or control unit without opening the enclosure

• Compensation of temperature influences

• Explosion protection in a temperature range of 20 to +50°C

• Functional check in the temperature range (see sensor specification)

• Smart Sensor System – sensor replacement via plug-in, pre-calibrated sensors

• Permanent status display (operating/fault) on transmitter (not EC28 i)

Measuring Method

The sensors integrated in the EC28 transmitter are electrochemical measuring cells. Electrochemical

measuring cells contain an electrolyte, a measuring electrode (anode), a counter electrode (cathode) and a

reference electrode. The selection of the gas type to be monitored is effected by selecting the specific

electrodes in combination with a suitable electrolyte. In this measuring method, an electric signal

proportional to the pollutant combination is produced in the measuring cell. This electric signal is amplified

in the EC28 and used for the indication or measurement value transmission. The measuring cells use the

capillary diffusion barrier technology. The use of this method and an additional temperature compensation

avoid a negative effect caused by fluctuating air pressure and temperature.

– 5 –

Transmitter Parts

EC28 DA

Cable inlet

Alarm LED´s

Display

Control buttons

Type plate with date of manufacture e.g. SN:0604xxxx (06=year, 04=month)

Status indicators

Horn(only on EC28 DA)

Sensor enclosure

green yellow Operating Fault

EC28 DA

Potential equalisation

Alarm LED’s

Button for quick calibration(AutoZero button)

behind locking screw

Connector forcontrol unit

– 6 –

The transmitter type is shown on the type plate. The sensor enclosure contains the sensor and the sensor

printed circuit board. The components for switching the sensor are mounted on the printed circuit board. The

integrated display or the RC2 control unit are used for setting the electrical zeropoint and the indication

sensitivity (calibration). A protected button for a quick zeropoint calibration is situated on the side of the

transmitter. The electronics on the main pcb converts the measurement signal to a linear 4 .. 20 mA

measured value output signal.

!Only the RC2 Control Unit (BVS 04 ATEX E 212) may be connected to the control unit

connector of the transmitter for service work.

The RC2 control unit may be used in explosion hazard zones.

The buttons, functions and indications

of the RC2 control unit are identical

with those of the transmitter.

Place of Transmitter Installation

!The enclosure was tested with an impact energy of 4 joules in accordance with EN

50014 Table 4 for Group II apparatuts (lower level of the mechanical risk).

The enclosure of the transmitter types, EC28, EC28 D, EC28 DA, EC28 DAR, EC28 B,

EC28 DB and EC28 DAB, must be protected against severe impact.

When selecting the place of installation it is important to exactly know and take into account the

environmental conditions. The ventilation conditions must be taken into account in order to achieve

representative measurement results.

The transmitter must be installed at a place where the gases can reach the sensor even with unfavourable

ventilation. A ‘selective’ measuring with, for example, smoke pipes, should be done if necessary.

An air flow to the transmitter from the bottom (sensor end) should be generally avoided.

The following external influences should also be taken into account

• rainwater, water splashes and drops, condensate

• the dust level in the atmosphere

The transmitter is largely protected against ingress of water and dust (IP 64).

Special accessories can be used to protect the transmitter from damage in the case of very difficult measuring

conditions. GfG will be pleased to advise you about suitable measures.

! The warranty can be voided if the sensor is exposed to environmental conditions that were

unknown to GfG during the planning or supply.

– 7 –

Installation

When selecting the place of installation, take into account that the transmitter must be accessible for service

and calibration work. The transmitter must be installed vertically with the sensor pointing downwards.

The transmitter must be connected to the controller in accordance with the terminal diagram (see Connectors

and Terminal Assignment). Four special screws must be screwed out and the enclosure lid removed for the

mounting. The enclosure is affixed with two screws.

The enclosure contains the printed circuit board encapsulated in potting compound (encapsulation ‘m’). The

terminal space (inherently safe ‘i’ for EC28 i and EC28 Di; increased safety ‘e’ for all other transmitter

types) for the connection of the controller is situated in the upper area in front of the pcb.

Installing the Electrical Connections

The cable laying and the connection of the electrical installation may only be performed by qualified persons

and in accordance with the applicable regulations. The electrical connection must be made with a screened

cable (e.g. LIYCY 3 x 0.75 mm2). The core cross-section is dependent on the length of the connecting cable

and the transmitter type. Cables with a core cross-section of 0.75mm² may be used for short distances of up

to 500m (200m for EC28 DA...). The core cross-section must be 1.5mm2 for longer distances. The cable

length must not exceed 1000m.

The screen must be connected in the M16x1.5 cable gland. A potential equalisation must be installed if the

transmitter is affixed to an electrically conducting mount (e.g. steel beam). Only the transmitter may be

installed in an explosion hazard zone – the controller and the power supply must be installed outside such

zone.

!The electrical installation of the transmitter must be effected so that the connecting

wires are directly routed from the cable inlet to the terminals! The connecting cable

must not come in contact with other internal electrical circuits.

! The installation of the transmitter may only be performed in the absence of gas. The

Transmitter may only be opened when the electrical power is switched off.

If the transmitter is not operated with the GMA controller, the operating voltage of its power supply must not

exceed 30V DC.

The lid of the enclosure must be sealed and screwed tight again after the electrical installation.

!The user must ensure that the voltage at the terminals of the transmitter can never exceed

the maximum fault voltage Vm shown on the type plate even in a fault condition.

Vm is 250V AC or 45V DC depending on the transmitter type.

– 8 –

Terminal diagram

1: 18…30V DC

2: 0V GND

3: Data+ (D1)

4: Data (D0) / 4...20mA

The number of terminals varies with the

expansion level of the EC28

5: 18…30V DC

6: 0V GND / COM relay

7: Data+ (D1) / NO relay

8: Data (D0) / NC relay

iSee Connectors and Terminal Assignment

for an exact connector description for the

different transmitter types.

Potential equalisation

Putting into Operation

The EC28 transmitter is tested for correct functioning and indication prior to delivery. The calibration is

done with suitable test gases. However deviations can arise under certain transport, installation or

environmental conditions.

The gas detection system must therefore be put into operation and checked for correct functioning by a

person authorised by the manufacturer or a qualified person.

The gas detection system needs a few minutes after the switch-on for:

• the self-test, which consists of a program and working memory test,

• reading and evaluation of the transmitter parameters with concurrent memory test

• reading and evaluation of the sensor parameters with concurrent memory test

• sensor warm-up

The memory tests are performed during the first few seconds of the switch-on phase. The current interface

output level is 0mA and the yellow and green LED’s are lit during this time. After the memory tests, the

current interface output level changes to 1.6mA and the Fault LED is lit and the Operating LED blinks

slowly. The Reading transm. param. ⁄ . message initially appears in the display. Transmitters with a

display (or the RC2 control unit) sequentially display measuring unit, gas type, measuring range, alarm limit

values and the calibration gas concentration.

The EC28 switches automatically to the measuring mode after a sensor warm-up phase – a countdown in

seconds appears in the display.

The transmitter switches to the fault mode if a transmitter fault/error is detected during the start phase. The

current interface outputs 1.2mA and a fault/error message is shown in the display (see Indications of Special

Conditions and Malfunctions). The Fault LED is permanently lit. The display light blinks in the display

variants.

potential equalisation

4mm² min.

RC2 connector

AutoZero switch

e.g. steel beam

sensor

cable

inlet

5

6

7

8

1

2

3

4

– 9 –

Notes:

The first putting into operation always requires an adjustment of the zeropoint (AutoCal ZERO) after its

warm-up time and subsequently a sensitivity check or calibration (AutoCal SPAN).

Measuring Mode

In measuring mode, the digital display shows the current gas concentration.

The display readout of the measurement value is always identical with the readout on the connected

RC2 control unit!

The measuring of the gas concentration is performed continuously. Sensor signals that exceed the limit value

are immediately detected by the EC28 (with Alarm function) and, if applicable, indicated visually. Functions

of the electronics, like parameter memory or the sensor, are continuously monitored. The green Operating

LED is lit and the yellow Fault LED is off in the faultless measuring mode.

i

As a ready signal to show that the EC28 is in the measuring mode, the display indication on the

RC2 control unit and on the EC28 Di changes from the gas concentration to the gas unit and gas

type for a short period at minute intervals.

On the EC28 with graphic display, a pending measurement value (>0) is displayed as a bar

graph which always shows the current measurement value in addition to the numeric value

(short display of measured gas and measuring unit every 30 seconds). The measured gas and the

measuring unit is always displayed additionally in the absence of a measurement signal.

Measuring Range Underflow

Measurement values below the zeropoint are displayed as a numerical value with a negative sign. The

current interface outputs a signal, corresponding to the measurement value, in the range of 2.8...4.0mA.

If the measurement value is less than 7.5% of the measuring range, the Fault LED will be permanently lit

and the display indication will alternate between the negative measurement value and ⁄ . The

current interface permanently outputs 2.8mA.

If the measurement signal is less than the measuring range of the transmitter electronics, the display

permanently shows ⁄ and the current interface outputs 1.2mA.

Measuring Range Overflow

A measuring range overflow between 100% and 112.0% of the measuring range is shown in the display by

⁄ alternating with the measurement value. The current interface outputs a signal, corresponding to

the measurement value, in the range of 20...22mA.

If the measurement value exceeds 112.0% of the measuring range, the display will show a blinking ⁄

. The current interface outputs 22mA.

If the measurement signal exceeds the measuring range of the transmitter electronics, the Fault LED will be

permanently lit, the display permanently shows ⁄ and the current interface outputs 22mA.

Control buttons

The functions of the buttons on the transmitter and on the RC2 control unit are always identical. The display

output of the EC28 Di is also identical with that of the RC2 control unit.

– 10 –

Display, LED and Horn Tests

A display/LED test is started if the ZERO

TEST

button is briefly pressed in the measuring mode. All LED’s and all

elements of the display are then lit for two seconds. On the EC28 DA, the Alarm LED’s are also briefly lit and

the horn is also briefly activated.

Display of Operating Parameters

A brief pressing of the SPAN

INFO

button during the measuring mode will cause an automatic sequential display of

the following main operating parameters.

• Measured gas 1

• Measuring unit 1

• Measuring range 1

• Calibration gas concentration 1

• Alarm 1 limit value 1 2

• Alarm 2 limit value 1 2

• Mean value of the last logged 8 hours

• Mean value of the last logged 15 minutes

1 Also displayed during the switch-on phase

2 Only displayed with alarm function

Example of a display sequence for the RC2 control unit with 7-segment display on an EC28 DA transmitter:

. . . . . .

Measurement Value Histogram

An alternative display mode can be selected if a graphic display is used. After the display of the operating

parameters was activated with the SPAN

INFO

button, a second brief pressing of the SPAN

INFO

button will cause a

histogram selection menu to appear.

Data for the last 24 hours, 8 hours and 2 hours can be viewed (selected by pressing the corresponding

marked button). Selecting a time period will cause a switch to the histogram display mode. You can then

switch between the display of the average values, maximum values or minimum values by briefly pressing

the ZERO

TEST

or the SPAN

INFO

button.

In the display area where the measurement value is normally shown, previous measurement values are now

displayed in the form of a histogram. The current pending measurement value is additionally displayed in the

upper area together with gas type and gas unit. The histogram is continuously updated and can be used as a

permanent display mode.

This display mode is terminated if the QUIT

MENU button is briefly pressed or if a special message (e.g. alarm

activation) appears.

Limit Value Alarm

The EC28 has two limit value alarms (if supported by transmitter). An alarm is activated as soon as the gas

concentration exceeds (or falls below) the respective alarm limit value (setting via the service menu). The

EC28 displays the limit value alarms via the LED row above the display, the display backlight and a horn.

When the gas concentration exceeds or falls below the first alarm limit value (Alarm 1), the display light and

– 11 –

the LED row are continuously activated in slow alternation. The display shows the current measurement

value alternating with Alarm 1 ⁄ .

When the gas concentration exceeds or falls below the second alarm limit value (Alarm 2), the display light,

the LED row and also the horn are activated in quick alternation. The display shows the current measurement

value alternating with Alarm 2 ⁄ .

The resetting of the limit value alarms can be effected automatically or manually, i.e. with or without self-

holding, depending on the function setting in the service menu.

The function of the horn is fixed and not changeable: activation with alarm 2, automatic switch-off when the

measurement value exceeds or falls below the second alarm limit value, always resettable with QUIT

MENU .

A self-holding alarm cannot be reset by pressing the QUIT

MENU button until the measurement value has fallen

below the alarm limit value.

Depending on the settings in the service menu (see according chapter) the relay (EC28 DAR only) is

activated by alarm release.

Sensor Life

Electrochemical sensors have a limited life. The anticipated life of the sensors used in the EC28 is 1-3 years

depending on the use conditions. The transmitter gives a warning that the sensor must be replaced during the

next maintenance some months before the end of the service life of the sensor. The warning is given by a

regular brief blinking of the Fault LED and the display of the Sensor replacement ⁄ warning in

alternation with the measurement value. If the sensor is not replaced within the next few months, the

transmitter will switch off the measuring mode when the sensor life has expired (Sensor life expired ⁄

). The current interface outputs 1.2mA, the yellow Fault LED goes on and the green Operating

LED briefly blinks once at intervals.

Transmitter Fault

If a transmitters fault is detected, the yellow Fault LED goes permanently ON, the current interface outputs

1.2mA and a fault/error message appears in the display (see Indications of Special Conditions and

Malfunctions).

A fault exists if, for example

• The sensor or the electronics in the transmitter is defective

• Faults are detected during the self-monitoring of the transmitter

• A sensor is not plugged in

See Indications of Special Conditions and Malfunctions for further causes.

The yellow Fault LED goes off as soon as the fault is corrected.

Checking and AutoCal Adjustment of Zeropoint (ZERO)

A precondition for this check in the case of TOX/NOX sensors is atmospheric air without disturbing gas

constituents. Synthetic air can be used instead for the adjustment in polluted atmospheres. 100% by vol. N2

must be used for the check/adjustment in the case of an oxygen sensor.

A calibration adapter can be attached to the sensor enclosure for the checking/adjustment. The sensor can be

fed with the synthetic air (or 100 % by vol. N2) pressureless at a flow rate of approx. 0.5 l/min. via this

calibration adapter..

A zeropoint calibration is necessary if the indication deviates from zero in measuring mode. A new zeroing is

also necessary after a change in the measured gas or sensor replacement.

– 12 –

The adjustment of the zeropoint can be performed with the AutoCal program if the displayed value remains

constant. The AutoCal program performs an automatic adjustment of the zero signal.

Activation

An automatic zeropoint calibration, via the AutoZero button or the normal access code is only

possible when the currently displayed value does not exceed 10% of the maximum measuring range.

On a transmitter without display, the operator cannot ascertain (before the pressing of the AutoZero button)

if the measurement value is within the permitted tolerance range for a zero calibration (i.e. < 10% of the

maximum measuring range). The transmitter will remain in the measuring mode if the measurement value

exceeded 10% of the maximum measuring range when the AutoZero button was pressed. This is noticeable

because the Fault LED remains OFF. In this case, the zeropoint adjustment can only be performed with the

control unit.

A competent operator can activate, with the access code 0055, the zeropoint calibration if the indication does

not exceed 15% of the maximum measuring range. This access code should only be used by trained safety

personnel of the user.

If the current zeropoint indication has exceeded a value corresponding to 15% of the maximum measuring

range and it has been confirmed that the indication was not caused by the presence of gas, a temporary zero

code (valid for a maximum of hour) can be read in the Info ⁄ submenu of the service menu (Zero Code

⁄ ), with which the zeropoint adjustment can be activated without restrictions.

Note:

The necessity for the last action can be an indication that the sensor is defective and therefore needs to be

replaced as quickly as possible.

The access code limits (10%/15%)are not applicable for operation with an oxygen sensor.

Procedure

The quick calibration is activated by pressing the protected AutoZero button (on the side of the enclosure) for at

least 3 seconds after the screw over the button has been removed. The current interface will then output

2.0mA, the Fault LED will flash slowly and step 3 of the following description will be automatically

activated.

The procedure with the keypad on the display or on the RC2 control unit is as follows:

1. Activation by a long pressing (at least 3 seconds) of the ZERO

TEST

button. After the activation, the current

interface outputs 2.0mA during the entire operation and the Fault LED flashes slowly. Code ⁄

appears in the display.

2. The numeric access code, or must now be entered. The digit at the current position can

be changed with the ZERO

TEST

and SPAN

INFO

buttons and confirmed with the QUIT

MENU button. A long pressing of

theQUIT

MENU button deletes the last confirmed digit.

3. After correct entry, the display shows the current measurement value in alternation with Zero ⁄ .

The new zeropoint is set if the measurement value remains constant for a defined time (for oxygen

sensors: after a recognized reduction of concentration and a fixed waiting time of 2 minutes). The

AutoCal program is then automatically terminated with the Save ⁄ message and the transmitter

switches back to the measuring mode.

In the case of oxygen sensors, the Finished ⁄ message is also shown to signal that the nitrogen

feed should be stopped. The transmitter waits for a measurement value increase before switching

back to the measuring mode.

– 13 –

Note:

If the current measurement value is outside the permitted limit for the respective access code, the Code

invalid ⁄ message will appear briefly during step 3 and the transmitter will switch back to the measuring

mode.

The AutoCal program can be shortened to a constant measurement value during the check by a long pressing of

the ZERO

TEST

button or the AutoZero button. The hardware then start directly with the zeropoint adjustment.

The AutoCal program can be terminated without zeropoint adjustment during the waiting time by a short

pressing of the ZERO

TEST

button or the AutoZero button. Quit ⁄ appears briefly in the display.

! The screw (with the seal) must be screwed in again until the end stop is reached after the

quick calibration with the AutoZero button on the side of the enclosure!

The following fault messages can appear during the zeropoint adjustment:

Display indication Comment Fault LED

Cal. error no. 2 ⁄ . The gas signal is unstable

Cal. error no. 3 ⁄ . The zeropoint is outside the permitted

tolerance range

Quick blinking

All fault messages must be acknowledged with the QUIT

MENU button or the AutoZero button on the side of the

enclosure. The transmitter switches back to the measuring mode with the unchanged zeropoint setting after

the acknowledgement.

Checking and AutoCal Adjustment of the Sensitivity (SPAN)

The RC2 control unit is required for a calibration in the case of a transmitter without display.

The set calibration gas concentration should be checked first by a short pressing of the SPAN

INFO

button. The

value of the test gas concentration should be at least 20% of the measuring range above the main alarm (i.e.

the alarm 2 threshold).

! Special safety precautions must be observed if there is a toxic gas exposure hazard.

Maximum Workplace Concentration values are guiding values for toxic gas hazard.

A calibration adapter must be attached to the sensor enclosure for the checking/adjustment of the readout

sensitivity. The sensor is then fed, via the calibration adapter, with the test/calibration gas (fresh air or

synthetic air in the case of an oxygen sensor) pressureless at a flow rate of approx. 0.5 l/min. The readout on

the display is monitored. A sensitivity adjustment is necessary if the displayed value differs from the

test/calibration gas concentration. The sensitivity adjustment can be done with the AutoCal program if the

displayed value remains constant. The AutoCal program performs an automatic adjustment of the

measurement signal to the calibration gas.

i The sensor must be free of calibration gas (zero reading) before each readjustment.

– 14 –

The procedure with the keypad on the display or on the RC2 control unit is as follows:

1. Activation by a long pressing (at least 3 seconds) of the SPAN

INFO

button. After the activation, the current

interface outputs 2.0mA during the entire operation and the Fault LED flashes slowly. Code ⁄

appears in the display.

2. The numeric access code, must now be entered. The digit at the current position can be changed

with the ZERO

TEST

and SPAN

INFO


MENU button. A long pressing of theQUIT

MENU

button deletes the last confirmed digit.

3. After correct entry, the display shows the current measurement value in alternation with Span ⁄ .

The transmitter now waits for a noticeable concentration increase. The measurement value is used for

updating the sensitivity if the measurement value remains constant for a defined time (after a fixed

waiting time of 2 minutes). The Save ⁄ message is then displayed. The adjustment data has

then been automatically updated. However, the transmitter does not immediately switch back to the

measuring mode because the still present calibration gas concentration would otherwise activate the

alarms. The transmitter waits in the adjustment mode until it detects a reduction in the gas

concentration and then a stabilisation of the displayed value. The display shows Zero ⁄ in

alternation with the current measurement value. The transmitter switches back to the measuring mode

after the stabilisation. If a gas reduction and stabilisation of the measurement value is not detected,

the transmitter automatically switches back to the measuring mode after 3 minutes.

Note:

The AutoCal program can be shortened in each phase by a long pressing of the SPAN

INFO

button. Save ⁄

will appear briefly in the display and the measurement value will be stored directly for an update of the

sensitivity.

Press the SPAN

INFO

button only briefly in order to terminate the AutoCal program without sensitivity

adjustment. Quit ⁄ .will appear briefly in the display.

The following fault messages can appear during the sensitivity adjustment:

Display indication Comment Fault LED

Cal. error no. 1 ⁄ . A calibration gas increase was not

detected

Cal. error no. 2 ⁄ . The gas signal is unstable

Cal. error no. 3 ⁄ . The gas signal is outside the permitted

tolerance range

Quick blinking

The fault messages must be acknowledged with the QUIT

MENU button. The transmitter switches to the measuring

mode without a new adjustment. The adjustment must be repeated.

Service Menu and Extended Service Menu

Service Menu Activation

The service menu allows you to view and change all important parameters of the EC28. The measuring mode

is interrupted when the service menu is selected, the transmitter switches to service mode, no alarms are

activated. The ‘Service’ special condition is signalled by a slow blinking of the Fault LED and a current

output signal of 2.4mA. The transmitter automatically exits the service mode and switches back to the

measuring mode if the operator does not press a key for one minute.

– 15 –

iAll the parameter changes made in the service menu relate to the currently selected

gas type! If the gas type and parameters are to be changed, you must first select the new gas type before

the parameter changes can be effective for this gas type.

The service menu can be called up in two different expansion levels.

The standard service menu is called up with the access code . No important settings, e.g. measured gas

or measuring range limit value, can be changed. Attempts to change such settings are ignored and

commented with the Barred ⁄ message.

The extended service menu is called up with the access code . All settings can be changed without

restriction in the extended service menu. This access code should only be used by specially trained safety

personnel of the user.

The procedure with the keypad on the display or with the RC2 control unit is as follows:

1. Press the QUIT

MENU button for at least 3 seconds. The transmitter then switches to the service mode. The

prompt Code ⁄ will appear in the display.

2. The numeric access code or must now be entered. The digit at the current position can be

changed with the ZERO

TEST

and SPAN

INFO


MENU button. A long pressing of

theQUIT

MENU button deletes the last confirmed digit.

3. After correct entry, you automatically jump back to the service menu at the Gas ⁄ menu item.

You can then select the other menu items with the ZERO

TEST

and SPAN

INFO

buttons.

Operating

The selection of a menu is done with the ZERO

TEST

and SPAN

INFO

buttons.

The activation of the desired menu/submenu item after its selection is done by briefly pressing the QUIT

MENU button.

The parameter change or the selection of a submenu is done with the ZERO

TEST

and SPAN

INFO

buttons.

The confirmation of a parameter is done by briefly pressing the QUIT

MENU button.

The service menu can be exited with or without a saving of the parameter changes.

Note:

Several parameters can be changed without having to leave the service menu between the changes in order to

save the change. A save operation at the end of the settings saves all parameters previously changed in the

service menu.

Exceptions: When the gas type is changed, the change is immediately saved after the confirmation of the

menu item and the parameters for this gas type are then activated the EC28 restarts. Date and time settings

are immediately saved.

Some parameters are related. A parameter change can therefore result in an automatic adjustment of other

parameters.

– 1

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17

Additional Menu Explanations

QuitExit service menu without saving entered parameter changes.

SaveExit service menu after saving all entered parameter changes.

GasThis function allows you to explicitly select a gas type and the parameters stored in the sensor. Only the gases

for which the sensor is intended and for which the sensor is parameterised will be displayed.

Note:

The EC28 automatically performs a restart if a gas type change is confirmed.

A gas type change always requires a zeropoint calibration (AutoCal ZERO) after its warm-up time and then a

sensitivity check and, if necessary, a calibration (AutoCal SPAN).

There are no restrictions for the first zeropoint adjustment after a gas change.

The parameters, e.g. measuring range, calibration gas concentration and alarm limit values should be checked

and, if necessary, adjusted, after a gas change.

Measuring range The measuring range limit value can be set in absolute steps of ...100, 150, 200, 250, 300, 400, 500, 750,

1000... but not smaller than 1⁄6 of the maximum measuring range limit value.

Note:

A change in the measuring range is primarily a conversion of the current output. The standardised output

signal of 4...20mA is used for the new measuring range. The numerical indication in the display is not changed

by this.

The alarm limit values must be checked and, if necessary adjusted after a reduction in the measuring range. If

alarm limit values were set to a higher value than the new measuring range limit value they will automatically

be set to the current measuring range limit value.

Cal. gas The calibration gas concentration setting must correspond with the concentration of the used calibration gas.

The calibration gas concentration can be set in the range of 10%–105% of the current measuring range limit

value.

Zero range The zero range of the sensor can be deactivated if necessary the true measured value about the zeropoint

will also be displayed.

Possible settings:

• Zero range activated (On ⁄ )

• Zero range deactivated (Off ⁄ )

InfoCallable/displayed transmitter information:

• Sensor type/MK number (Sensor type ⁄ . )

• Sensor serial number (Sensor no. ⁄ . )

• Software version (Software ver. ⁄ . )

• Transmitter serial number (Man. no. ⁄ . . )

• Zero code (ZERO Code ⁄ )

Note:

The number shown under ZERO Code ⁄ is an access code that is valid for a limited period of time and

can be used to activate the zeropoint adjustment without restrictions (see AutoCal ZERO).

18

The info items are automatically displayed once in sequence in the case of a connected RC2 or no graphic

display – you otherwise proceed with the SPAN

INFO

button.

Alarm Alarm 1 andAlarm Alarm 2This alarm is activated when its alarm limit value is reached.

The maximum value of the alarm limit values is the current measuring range limit value. However Alarm 1

cannot be set greater than Alarm 2 in the case of a ‘greater than’ alarm and Alarm 1 cannot be set smaller than

Alarm 2 in the case of a ‘less than’ alarm. For example, in the case of a greater than alarm, Alarm 2 can only

be set to nought if Alarm 1 was previously set to nought.

An alarm is deactivated if its limit value is set to nought.

Note:

The horn in the EC28 is also activated if Alarm 2 is activated.

Alarm A1 hys. andAlarm A2 hys. The hysteresis describes the difference between the switch-on and switch-off point of the alarm limit values.

A value greater than nought delays the alarm switch-off by this value with respect to the alarm limit value that

sets the alarm.

The maximum settable hysteresis is limited to 5% of the maximum measuring range limit value. Furthermore,

it cannot be greater than the alarm limit value in the case of a ‘greater than’ alarm or in the case of a ‘less than’

alarm, the current measuring range limit value less the alarm limit value.

Alarm A1 func. undAlarm A2 func. Possible function settings for Alarm 1 and Alarm 2 are:

• Alarm on ‘less than’, storing alarm, manually resettable after alarm activation

(Under-stor.-reset ⁄ )

• Alarm on ‘less than’, non-storing alarm, not manually resettable

(Under-n.stor.-n.reset ⁄ )

• Alarm on ‘greater than’, non-storing alarm, not manually resettable

(Above-n.stor-.reset ⁄ )

• Alarm on ‘greater than’, storing alarm, manually resettable after alarm activation

(Above-stor.-reset ⁄ )

Note:

The function of the horn on the EC28 is fixed to: ‘Alarm on ‘less than’ or ‘greater than’ limit value of Alarm

2, non-storing alarm, manually resettable even with existing alarm conditions“

Relay Relay func.Possible function settings for the relay are:

• Tripping during the calibration (AutoCal SPAN) for calibration gas feed

(Cal. pump ⁄ )

• Continuos tripping on Alarm 1 (Alarm 1 ⁄ . )

• Continuous tripping on Alarm 2 (Alarm 2 ⁄ . )

• Alternating tripping (interval) on Alarm 1 and continuous tripping on Alarm 2

(Alarm 2 + 1 Int. / .

Relay Relay mode Possible operating mode settings for the alarm relay:

• Normally closed mode (N-closed ⁄ . .)

• Normally open mode (N-open ⁄ . .)

19

Relay Test The relay is tripped twice briefly.

Language/Time/Bus Language Possible language settings:

• German (Deutsch ⁄ )

• English (English ⁄ )

• Spanish (Espanol ⁄ )

Note:

The language setting mainly affects the visualisation in the graphic display.

Language/Time/Bus TimeSetting sequence: year, month, day, hours, minutes

Language/Time/Bus Modbus slave addr. Setting range: 1–247

Note:

See also separate ‘EC28 – MODBUS Implementation’ document.

Language/Time/Bus Modbus com. param. Possible interface settings:

• 19200 Baud, 8 data bits, no parity, 2 stop bits (19200, 8N2 ⁄ )

• 19200 Baud, 8 data bits, even parity, 1 stop bit (19200, 8E1 ⁄ )

• 9600 Baud, 8 data bits , no parity, 2 stop bits (9600, 8N2 ⁄ )

• 9600 Baud, 8 data bits , even parity, 1 stop bit (9600, 8E1 ⁄ )

Note:

See also separate ‘EC28 – MODBUS Implementation’ document’.

Sensor Replacement

The GfG sensors are equipped with a non-volatile memory in which the sensor data (serial number etc.), the

calibration data and the selectable gas types are stored.

To replace the sensor, you must undo the Allen screw on the side of the sensor enclosure (see Transmitter

Parts) and carefully pull off downwards the sensor enclosure. The sensor must also be pulled off downwards

and the new sensor then carefully plugged in. The plug-in connector has a misalignment protection – the

sensor can only be plugged-in in one orientation. The sensor enclosure must be mounted again correctly and

then fixed with the screw.

After removal of the sensor, the display, the status LED and the current output (depending on transmitter

variant) signal a Sensor error no. 1 ⁄ . (see Indications of Special Conditions and Malfunctions).

The EC28 performs a restart after the new sensor has been installed (See Putting Into Operation for sequence

and information).

Fault message Confirm gas change ⁄

If the new sensor is not specified for the gas type set (as the measured gas) on the transmitter this will be

detected during the transmitter powerup. This will be signalled in the display and the green LED will give a

double blink (2x short blinks). The EC28 does not switch to the measuring mode.

Pressing theQUIT

MENU button for at least 3 seconds and then entering will take you to the (extended) service

menu where you can change the menu item, Gas ⁄ , to a measured gas that is supported by the sensor (see

Service menu Changing the measured gas).

20

Fault message Confirm measuring range ⁄

If the measuring range setting in the new sensor differs from that in the old sensor, this will be detected during

the transmitter powerup. This will be signalled in the display and the green LED will give a double blink (2x

short blinks). The EC28 does not switch to the measuring mode.

Pressing the QUIT

MENU button for at least 3 seconds and then entering or 1100 will take you to the service

menu where you can check, and if necessary change, the measuring range with the menu item, Measuring

range ⁄ (see Service menu Setting the measuring range limit value). You must then exit the service

menu via the menu item, Save ⁄ .

Note:

The installation of a new sensor always requires a zeropoint calibration (AutoCal ZERO) after its warm-up

time and then a sensitivity check and, if necessary an adjustment (AutoCal SPAN).

There are no restrictions for the first zeropoint calibration after a sensor replacement.

Transmission Properties

The transmitter has different transmission properties depending on the measured gas type. The warm-up times

can differ depending on the measured gas. The signal output is always proportional to the gas concentration.

Indications and Messages

iThe indication of special conditions via the current interface (<2.8mA) is not possible

in the case of the EC28 i or EC28Di. The current output during these special

conditions has a minimum value of 2.8mA.

Indications of Special Conditions and Malfunctions

The following table contains descriptions of the special conditions for which the yellow Fault LED is

permanently lit (exceptions: EC28 i and EC28 Di) and the current interface outputs 1.6mA. In the case of a

transmitter without display, the following fault messages should be displayed with the RC2 control unit for

better diagnosis or the exact value of the current output should be evaluated.

No. Indication Green

LED

Yellow

LED

Current

output

Cause Note/Explanation

Self-test001 ON ON 0mA Program and memory tests at

start of system powerup

Readingtransmitter parameters

Operating

parameters

002

Operating

parameters

Blinks ON 1.6mA System powerup (during start

after measured gas or sensor

change)

Switches automatically to

the sensor warm-up phase

Sensor warm-upSeconds countdown

003

Seconds countdown

Blinks ON 1.6mA Sensor warm-up phase Switches automatically to

the measuring mode after

completion

21


LED

Yellow

LED

Current

output


Sensor life exceeded101 Single

pulses

ON 1.2mA Sensor life expired Sensor must be replaced

Confirm gas change102 Double

pulses

ON 1.2mA Sensor is not specified for the

measured gas

(after sensor replacement)

Replace sensor again or

select other measured gas

(see Sensor Replacement)

Confirm measuring range

103 Double

pulses

ON 1.2mA Measuring range setting of

sensor and transmitter do not

correspond for selected

measured gas

(after sensor replacement)

Check SCAL measuring

range and change if

necessary (see Sensor

Replacement)

System error (Working memory

defective)

104

.

OFF ON 1.2mA Error during RAM access

System error (Prog. memory

defective)

105

.

OFF ON 1.2mA Error during ROM access

System error (Param. memory

defective)

106

.

OFF ON 1.2mA Error during EEPROM access

(internal)

System error (Temperature measurement

defective)

107

.

OFF ON 1.2mA Temperature measurement not

plausible

ADC error (Temperature

measurement error)

108

.

OFF ON 1.2mA A/C Converter error

(Temperature

measurement/NTC)

Restart transmitter.

Replace transmitter if error

message is repeated

Sensor error (No sensor detected)

109

.

OFF ON 1.2mA No sensor present/detected Install sensor

(automatic restart)

Sensor error (Param. memory

defective)

110

.

OFF ON 1.2mA Error during EEPROM access

(Sensor)

Sensor error (Param. memory

error)

111

.

OFF ON 1.2mA Incorrect sensor/parameter

memory

Replace sensor (automatic

restart)

22

Indications in Measuring Mode


LED

Yellow

LED

Current

output


permanent

201

„ “

permanent

ON ON 22mA The gas concentration has

exceeded the measuring range of

the transmitter electronics

Measurement value

in alternation with

202

Measurement value

in alternation with

„ “

ON OFF 22mA The gas concentration has

greatly exceeded the measuring

range ( 112.5% of the

measuring range)

Measurement value

in alternation with

203

Measurement value

in alternation with

„ “

ON OFF 20..22mA The gas concentration has

exceeded the measuring range

(100...112.5% of the measuring

range)

Measurement value

in alternation with

Alarm 2

204

Measurement value

in alternation with

ON OFF 4...20mA The gas concentration has

reached/exceeded the 2nd alarm

threshold

Measurement value

in alternation with

Alarm 1

205

Measurement value

in alternation with

ON OFF 4...20mA The gas concentration has

reached/exceeded the 1st alarm

threshold

Reduce the gas

concentration!!!

Scaling warning206

.

ON OFF 4...20mA Precautionary warning:

Measuring range limit no longer

detectable by hardware/sensor

combination

Acknowledge with QUIT

MENU

a) Readjust sensor (SPAN)

b) Adjust/reduce the

measuring range in the

service menu

Check supply voltage

207 ON OFF 4...20mA Precautionary warning:

The supply voltage is not in the

required range

Check/adjust the supply

voltage

Sensorreplacement

208 ON Single

pulses

4...20mA Precautionary warning:

The sensor life will expire in the

next few months

Replace sensor during next

maintenance

209 Measurement value ON OFF 4...20mA Faultless measuring mode

210 Measurement value ON OFF 2.8...4mA Measuring range underflow

( 7.5...0.0% of the measuring

range)

211 Measurement value ON ON 2.8mA Measuring range underflow (<

7.5% of the measuring range)

Zeropoint calibration

necessary

Measurement value

in alternation with

212

Measurement value

in alternation with

„ “

ON ON 1.2mA Measuring signal below the

measuring range of the

transmitter electronics

Zeropoint calibration

necessary, then check

sensitivity

23

Note:

In measuring mode, the messages listed in the second column are displayed in alternation with the

measurement value. The indications described in no. 204 and no. 205 only apply for the EC28 DA. The

indications described in no.. 206–208 are precautionary warning messages. The transmitter remains in

measuring mode and an immediate action by the operator is not necessary. The conditions described in no. 203

and no. 210 relate to a de facto expansion of the measuring range of 4...20mA to the 2.8...22mA range in order

to display measurement values ‘close’ to the actual measuring range. This creates a tolerance range around the

4...20mA before a special condition is displayed.

Indications in Service Mode and During Calibration

No. Indication Gree

n

LED

Yellow

LED

Current

output


301 Menu item ON Blinks 2.4mA Service menu was activated via

keypad or the RC2

Select menu item

Automatic return to

measuring mode if no input

occurs for one minute

ZERO302 ON Blinks 2.0mA AutoCal adjustment of the

zeropoint was activated via

keypad, the RC2 or the

AutoZero button

Automatic termination

after successful calibration

SPAN303 ON Blinks 2.0mA AutoCal adjustment of the

sensitivity was activated via

keypad or the RC2

Automatic termination

after successful calibration

Cal. error (No conc. change)

304

.

ON Blinks

quickly

2.0mA An increase in the calibration

gas concentration was not

detected during the AutoCal

adjustment of the sensitivity


MENU

a) check gas feed

b) Select calibration mode

before gas feed

Cal. error (Gas not stable)

305

.

ON Blinks

quickly

2.0mA No stable zero gas / calibration

gas concentration was detected

during the AutoCal adjustment


MENU

a) stabilise gas feed

Cal. error (Calibr. not plausible)

306

.

ON Blinks

quickly

2.0mA The zeropoint / sensitivity is

outside the permitted tolerance

range


MENU

a) Check zero / calibration

gas and repeat procedure.

b) Replace sensor if

necessary

24

Conditions of Status LED’s and Current Output

The following table gives a better overview of the different indications of both status LED’s and the current

output signals and their meaning for a transmitter without display

The RC2 control unit is required for zeropoint calibration (when indication > 25% of the measuring range), for

adjustment and for calling up the service menu in the case of a transmitter without display.

Green LED Yellow LED Current output For a description, see section ...

ON ON 2.8mA Indications in measuring mode No. 211

ON ON 1.2mA Indications in measuring mode No. 212

ON ON 0mA Indications of special conditions... No. 001

ON ON 22mA Indications in measuring mode No. 201

ON OFF 22mA Indications in measuring mode No. 202

ON Blinks quickly 2.0mA Indications in service mode... No. 304–306

ON Blinks slowly 2.4mA Indications in service mode... No. 301

ON Blinks slowly 2.0mA Indications in service mode... No. 302, 303

ON Single pulses 4...20mA Indications in measuring mode No. 208

ON OFF 20...22mA Indications in measuring mode No. 203

ON OFF 4...20mA Indications in measuring mode No. 204–207, 209

ON OFF 2.8...4mA Indications in measuring mode No. 210

Blinks ON 1.6mA Indications of special conditions... No. 002, 003

Single pulses ON 1.2mA Indications of special conditions... No. 101

Double pulses ON 1.2mA Indications of special conditions... No. 102, 103

OFF ON 1.2mA Indications of special conditions... No. 104–111

Priority of Indications and Messages in Measuring Mode

The indication of conditions with lower priority are overwritten by indications with higher priorities. The

conditions with lower priorities are not reset.

Priority Condition For a description, see section ...

A/D converter fault Indications of special conditions... No. 108

Measuring range overflow Indications in measuring mode No. 201–203

Alarm2 Indications in measuring mode No. 204

Alarm1 Indications in measuring mode No. 205

Measuring range underflow Indications in measuring mode No. 211, 212

Power supply fault (Warning) Indications in measuring mode No. 207

‘SCAL Error’ (Warning) Indications in measuring mode No. 206

Sensor replacement (Warning) Indications in measuring mode No. 208

System/sensor faults (No. 101 and No. 104–111) interrupt the measuring mode with their respective

indication/message.

First Putting Into Operation and Maintenance

The DIN EN 50073 standard, ‘Guide for the selection, installation, use and maintenance of apparatus for the

detection and measurement of combustible gases or oxygen’ and other national regulations must be observed.

During the first putting into operation, gas detection systems must be checked for correct functioning by a

qualified person after their installation (see DIN EN 50073, section 6.4.1)

The maintenance includes service, maintenance, calibration and adjustment, as well as regular functional

checks and repair.

The checks must be done by a qualified person and a written record of the results must be kept.

25

Service, Maintenance, Calibration and Adjustment

The service should include visual checks on the gas detection system.

• Mechanical damage

• Contamination by dust

• Condensation due to moisture

• Protective devices for transmitters

• Diffusion openings of the transmitters

• Gas offtake system, gas processing (if installed)

Maintenance and adjustment consist of work that maintains the operability of the gas detection system. It

should be done at regular intervals. An interval of 4 months should normally not be exceeded. (see DIN

EN 50073, section 6.4.3).

• Zeropoint

• Sensitivity with test/calibration gas

• Tripping of the alarm thresholds

• Response time

• Output functions, visual and audible

• Fault/error messages/indications

We recommend that this work be done by GfG customer service.

Regular Functional Checks

Gas detection systems can behave differently depending on the environmental conditions. It is therefore

important to carry out a daily visual check, particularly during the first few days after a new putting into

operation.

The correct functioning of the gas detection system must be checked at regular intervals in addition to the

maintenance work. The interval must not exceed 1 year.

The checks must be done by a qualified person and a written record of the results must be kept.

Repair

Repair means all repair and replacement work. Repair may only be performed by the manufacturer and

persons authorised by the manufacturer – i.e. GfG Gesellschaft für Gerätebau mbH. Only original spare

parts/assemblies tested and approved by the manufacturer may be used.

Fault – Cause – Remedy

Fault Cause Remedy

Zeropoint can no longer be

adjusted

Defective sensor Replace the sensor

Sensitivity can no longer be

adjusted

Defective sensor Replace the sensor

Output current level has dropped

to 0mA

Defective fuse;

Supply cable not connected

Replace the fuse;

Make the connection

26

Accessories

Part no.

RC2 control unit 2800201

EC28 calibration adapter for non-reactive gas for calibration of the transmitter 2810202

EC28 calibration adapter for reactive gas for calibration of the transmitter On request

EC28 flow adapter On request

Zener barrier SB 4420 On request

Connectors and Terminal Assignment

The number of terminals

varies with the expansion level of the EC28. cable

feed

5

6

7

8

1

2

3

4

EC28 i with 4...20mA interface (two-wire) and Zener barrier

1: 21...27V DC power supply (in front of

the Zener barrier, see the Accessories

section)

2: 0V GND power supply

Current measuring (4...20mA) in the supply

cable

EC28 with 4...20mA interface (three-wire)

1: 18...30V DC power supply


3: –

4: 4...20mA current output

EC28 with 4...20mA interface (three-wire) and relay



3: –

4: 4...20mA current output

6: COM Relay

7: NO Relay

8: NC Relay

EC28

18...30V DC max. 200 Ohm max. 30V AC/DC 1A

1 2 4 6 7 8

EC28

18...30V DC max. 200 Ohm

1 2 4

EC28

1 2 21...27V DC

max. 100 Ohm

27

EC28 with MODBUS interface (RS-485)



3: Data+ (D1)

4: Data (D0)



7: Data+ (D1)

8: Data (D0)

Note: See separate ‘EC28 – MODBUS Implementation’ documentation for operating specifications.

Measured gases and measuring ranges

Measured gas Standard

measuring

range

Smallest / largest

measuring ranges

MK number

Ammonia (NH3) 0...100 ppm

0...500 ppm

0... 40 to 200 ppm

0...200 to 1000 ppm

MK393-7

MK399-7

Chlorine (Cl2) 0...10 ppm

0...50 ppm

0...10 to 50 ppm

0...50 to 250 ppm

MK390-7

MK304-4

Chlorine dioxide (ClO2) 0...2 ppm 0... 1 to 2 ppm MK391-7

Hydrogen chloride (HCl) 0...10 ppm

0...50 ppm

0... 5 to 30 ppm

0...40 to 200 ppm

MK392-7

MK309-7

Hydrogen cyanide (HCN) 0...50 ppm

0...100 ppm

0...10 to 50 ppm

0...40 to 200 ppm

MK409-7

MK336-7

Ethylene oxide (C2H4O) 0...20 ppm 0...20 to 100 ppm MK340-7

Hydrogen fluoride (HF) 0...10 ppm — MK412-7

Carbon monoxide (CO) with warning of H2S

0...300 ppm

0...1000 ppm

0...100 to 500 ppm

0...400 to 2000 ppm

MK174-7

MK174-4

Carbon monoxide (CO) without warning of H2S

0...300 ppm

0...1000 ppm

0...100 to 500 ppm

0...400 to 2000 ppm

MK175-7

MK175-4

Carbon monoxide (CO) without warning of H2S

reduced hydrogen cross sensitivity

0...300 ppm 0...100 to 500 ppm MK369-7

Ozone (O3)for MAC monitoring

0...1 ppm — MK411-7

Ozone (O3)for leak monitoring

0...3 ppm 0...1 to 5 ppm MK397-7

Phosgene (COCl2) 0...2 ppm 0...1 to 2 ppm MK349-7

Oxygen (O2) 0...25 % by vol. 0...5 to 30 % by vol. MK398-7

Sulphur dioxide (SO2) 0...10 ppm

0...100 ppm

0...10 to 50 ppm

0...100 to 500 ppm

MK306-7

MK307-7

Hydrogen sulphide (H2S) 0...50 ppm

0...200 ppm

0...40 to 200 ppm

0...200 to 1000 ppm

MK176-7

MK177-7

Hydrogen sulphide (H2S)reduced methanol cross sensitivity

0...50 ppm 0...40 to 200 ppm MK429-7

Silane (SiH4) 0...20 ppm 0...10 to 50 ppm MK404-7

Nitrogen dioxide (NO2) 0...30 ppm

0...100 ppm

0...10 to 50 ppm

0...40 to 200 ppm

MK310-7

MK310-4

Nitrogen monoxide (NO) 0...100 ppm

0...500 ppm

0...50 to 300 ppm

0...300 to 1500 ppm

MK179-7

MK179-4

Hydrogen (H2) 0...2000 ppm

0...1 % by vol.

0...2 % by vol.

0...400 to 2000 ppm

0...0.2 to 1 % by vol.

0...1 to 4 % by vol.

MK305-7

MK402-7

MK403-7

31 2 4 5 6 7 8

EC28

18...30V DC

twisted pair

28

Sensor specification MK174-7 (-4) Electrochemical sensor for carbon monoxide CO

Response time t90: <40 sec

Pressure 800...1200 hPa: max. 3ppm or 7% of reading (at 1000 hPa)

Humidity 15%...90% R.H.: max. 3ppm or 7% of reading (at 50% R.H.)

Temperature -20...+40(50)°C: max. 3(5)ppm or 7(10)% of reading (at 20°C)

Cross-sensitivities H2S % , C2H4<10 % , SO2 % , H2<60% , NO2 -60% , HCN % , Cl2 -50% , NO % (*1)

Anticipated life: 3 years

MK175-7 (-4) Electrochemical sensor for carbon monoxide COResponse time t90: <45 sec




Cross-sensitivities H2S % , C2H4<10 % , H2<60% , HCN % , NO % , NO2 -10% , HCL=SO2 Cl2 % , (*1)


MK176-7 Electrochemical sensor for hydrogen sulphide H2SResponse time t90: <40 sec



Temperature -20...+50°C: max. 1ppm or 7% of reading (at 20°C)

Cross-sensitivities: SO2 20% , NO2<-20% , Cl2 20% , HCN<-10% , NO<6%, CO<0, % , H2<0.1% (*1)

Anticipated life: 2..3 years





Cross-sensitivities: SO2 20% , NO2<-20% , HCN<-15% , Cl2 % , CO<2% , H2<0.1% , NO=0% (*1)


MK179-7 (-4) Electrochemical sensor for nitrogen monoxide NO Response time t90: <25 sec



Temperature -20...+35(50)°C: max. 3(6)ppm or 7% of reading (at 20°C)

Cross-sensitivities: H2S % , NO2<30% , HCl<20% , SO2=CO=NO=HCN=Cl2=0% (*1)


Warm-up time: 3 minutes to one day – depending on switch-off duration

MK304-4 Electrochemical sensor for chlorine Cl2Response time t80: <70 sec

Pressure 800...1200 hPa: max. 0.2ppm or 10% of reading (at 1000 hPa)

Humidity 15%...90% R.H.: max. 0.2ppm or 10% of reading (at 50% R.H.)

Temperature -20...+35(50)°C: max. 0.3(0.5)ppm or 10% of reading (at 20°C)

Cross-sensitivities: NO2 100% , H2S<-10% , SO2<-1% , H2=HCN=HCl=NO=CO=0% (*1)


MK305-7 Electrochemical sensor for hydrogen H2




Temperature -20...+40(50)°C: max. 10(20)ppm or 20% of reading (at 20°C)

Cross-sensitivities: C2H4 % , NO % , HCN % , CO<2 % , H2S< % , SO2=NO2=Cl2=HCl= % (*1)


MK306-7 Electrochemical sensor for sulphur dioxide SO2




Temperature -20...+50°C: max. 0.2ppm or 5% of reading (at 20°C)

Cross-sensitivities: H2S 130% , NO2 -120% , HCN 50% , Cl2 % , HCl 0% , CO<1% , NO=0% (*1)


MK307-7 Electrochemical sensor for sulphur dioxide SO2





Cross-sensitivities: NO2 -100% , Cl2 % , HCN 50% , CO<2% , H2S=HCl=H2=NO=0% (*1)


MK309-7 Electrochemical sensor for hydrogen chloride HCl Response time t90: <150 sec




Cross-sensitivities: H2S: 60..150% , SO2: 30..70% , NO2<10% , Cl2: -5..+10% , HCN<3% , CO<1% , NO=0% (*1)


Warm-up time: 10 minutes to seven days – depending on switch-off duration

For (*1): Gas indication for the fed concentration in the range of MAC values

29

MK310-7 (-4) Electrochemical sensor for nitrogen dioxide NO2




Temperature -20...+40(50)°C: max. 0.3(0.5)ppm or 5% of reading (at 20°C)

Cross-sensitivities: Cl2 100% , H2S<-10% , SO2<1% , HCl=HCN=H2=NO=CO=0% (*1)


MK336-7 Electrochemical sensor for hydrogen cyanide HCN Response time t90: <150 sec

Pressure 800...1200 hPa: max. 1 ppm or 10% of reading (at 1000 hPa)

Humidity 15%...90% R.H.: max. 1 ppm or 10% of reading (at 50% R.H.)

Temperature -20...+35(50)°C: max. 1(3) ppm or 15% of reading (at 20°C)

Cross-sensitivities: H2S 0% , SO2<300% , NO2<-300% , Cl2 -50% , NO<40% , CO<12% , H2=0% (*1)


MK340-7 Electrochemical sensor for ethylene oxide C2H4OResponse time t90: <150 sec




Cross-sensitivities: CO % , CH4O % , C2H2 % , CH2O % , CH4S % , C2H4 % , C2H6O 5% , C7H8 0% ,

MEC 0% and others. (*1)


Warm-up time: 4 minutes to seven days – depending on switch-off duration

MK349-7 Electrochemical sensor for phosgene COCl2Response time t90: <150 sec




Cross-sensitivities: C2H6O=CO2=CO=Cl2=H2=HF=PH3=SO2: 0% HCN=H2S: 0% (poisoning after long gas exposure) (*1)

Anticipated life: 1..1.5 years

MK369-7 Electrochemical sensor for carbon monoxide COResponse time t20: <10 sec t90: <30 sec




Cross-sensitivities: H2: <10% , NO: <9% , H2S: 0% , SO2: 0% (*1)


MK390-7 Electrochemical sensor for chlorine Cl2Response time t90: <30 sec




Cross-sensitivities: F2: % , ClO2: % , NO2: 12% , H2S: -3% , HCl: <2% , CO: 0% , SO2: 0% (*1)


MK391-7 Electrochemical sensor for chlorine dioxide ClO2





Cross-sensitivities: Cl2: % , H2S: -0,2% , H2=CO2=CO=GeH4=B2H6: 0% (*1)


MK392-7 Electrochemical sensor for hydrogen chloride HCl Response time t90: <90 sec




Cross-sensitivities: PH3: 300% , H2S: 28% , Cl2: 20% , HCN: 7% , CO: 1% , C2H6O=CO2=H2=HF=N2: 0% (*1)


MK393-7 Electrochemical sensor for ammonia NH3





Cross-sensitivities: CO: 0% , CO2: 0% , H2: 0% , C2H6O: 0% , Cl2: 0% , HCN: 0% , N2: 0% , H2S: 0% (in minutes range) (*1)


MK397-7 Electrochemical sensor for ozone O3


Pressure 800...1200 hPa: max. 0.03 ppm or 10% of reading (at 1000 hPa)

Humidity 15%...90% R.H.: max. 0.03 ppm or 10% of reading (at 50% R.H.)

Temperature -20...+50°C: max. 0.05 ppm or 15% of reading (at 20°C)

Cross-sensitivities: ClO2 % , NO2 80 , H2S 70 Cl2 % , SO2 50 CO<0.1% (*1)



30

MK398-7 Electrochemical sensor for oxygen O2

Response time t20: <10 sec t90: <20 sec

Pressure 800...1200 hPa: max. 0.2% by vol. or 2.5% of measuring range (at 1000 hPa)

Humidity 0%...99% R.H.: max. 0.2% by vol. or 2.5% of measuring range (at 50% R.H.)

Temperature -20...+40(50)°C: max. 0.3(0.5)% by vol. or 2(4)% of reading (at 20°C)

Anticipated life: 2 years in air

MK399-7 Electrochemical sensor for ammonia NH3





Cross-sensitivities: CO=CO2=H2= C2H6O=Cl2=HCN=N2: 0% H2S: 0% (in minutes range) (*1)




Pressure 800...1200 hPa: max. 0.01% by vol. or 10% of reading (at 1000 hPa)

Humidity 10%...90% R.H.: max. 0.01% by vol. or 10% of reading (at 50% R.H.)

Temperature -20...+50°C: max. 0.02% by vol. or 20% of reading (at 20°C)

Cross-sensitivities: CO: <15% , Cl2: 80 % (*1)




Pressure 800...1200 hPa: max. 0.01% by vol. or 10% of reading (at 1000 hPa)

Humidity 10%...90% R.H.: max. 0.01% by vol. or 10% of reading (at 50% R.H.)

Temperature -20...+50°C: max. 0.02% by vol. or 25% of reading (at 20°C)

Cross-sensitivities: CO: <15% (*1)


MK404-7 Electrochemical sensor for silane SiH4





Cross-sensitivities: PH3: 1 % , GeH4: 100% , AsH3: 70% , B2H6: 55% , Cl2: -8% , CO: 4% , CO2=H2=HF=0% (*1)


MK409-7 Electrochemical sensor for hydrogen cyanide HCN Response time t90: <60 sec




Cross-sensitivities: NO2: -120% , Cl2: -20% , CO: 0% , CO2: 0% , H2: 0% , HF: 0% , NO: 0% , PH3: 0% (*1)


MK411-7 Electrochemical sensor for ozone O3





Cross-sensitivities: Cl2: % , ClO2: % , NO2: 60..8 , F2: PH3: 1 H2: , HCN: -0.3% (*1)


MK412-7 Electrochemical sensor for hydrogen fluoride HF Response time t50: <40 sec t90: <90 sec




Cross-sensitivities: Cl2 % , NO2>1% , CO=CO2=H2S=H2=0% (*1)





Temperature -20...+40(50)°C: max. 3ppm or 10(15)% of reading (at 20°C)

Cross-sensitivities: SO2: 20% , NO2: -20% , NO: <2% , CO: <1% , H2 <0.1%, reduced methanol cross-sensitivity (*1)



31

Internal Parameter Memory of the EC28

Each transmitter is programmed with the data for the main gases and their additional parameters. This means

that the user does not need to change the configuration in most cases. The following data is stored in the

internal memory of the transmitter:

Gas type Formula Unit CGAS Calibration gas

A1Alarm 1

A2Alarm 2

H1Hyst. A1

H2Hyst. A2

F1 A1

function

F2A2 function

Carbon monoxide CO ppm 200 30 60 0 0 HNS H SC

Hydrogen sulphide H2S ppm 50 10 20 0 0 HNS H SC

Chlorine Cl2 ppm 5.0 0.5 1.0 0.0 0.0 HNS H SC

Hydrogen cyanide HCN ppm 50 10 20 0 0 HNS H SC

Hydrogen chloride HCl ppm 10 5 10 0 0 HNS H SC

Nitrogen monoxide NO ppm 50 25 50 0 0 HNS H SC

Nitrogen dioxide NO2 ppm 20 5 10 0 0 HNS H SC

Sulphur dioxide SO2 ppm 10 2 4 0 0 HNS H SC

Ammonia NH3 ppm 100 50 100 0 0 HNS H SC

Ethylene oxide C2H4O ppm 10 2 4 0 0 HNS H SC

Ozone O3 ppm 1.00 0.30 0.50 0.05 0.05 HNS H SC

Oxygen O2 % by vol. 20.9 19.0 17.0 0 0 LNS L SC

Chlorine dioxide ClO2 ppm 1.00 0.10 0.30 0.03 0.03 HNS H SC

Hydrogen fluoride HF ppm 6.6 3.0 5.0 0.0 0.0 HNS H SC

Phosgene COCl2 ppm 1.0 0.1 0.2 0.0 0.0 HNS H SC

Silane SiH4 ppm 5 5 10 0 0 HNS H SC

Hydrogen H2 % by vol. 1.0 0.2 0.4 0 0 HNS H SC

Hydrogen H2 ppm 1000 1000 1500 0 0 HNS H SC

Defined settings will be used if the transmitter is operated with a sensor for which data has not been entered in

this list.

The user can individually modify these settings for this gas and then store them in the transmitter.

32

Technical Data – Part 1

Transmitter types EC28, EC28 D, EC28 DA, EC28 DAR, EC28 B, EC28 DB and

EC28 DAB

Measuring function Measured gas: Toxic gases and vapours and oxygen

Measuring range: See inspection record

Gas feed: Diffusion

Response/Warm-up time: See sensor specification

Measuring principle: Electrochemical

Anticipated sensor life: See sensor specification

Output signal: 4...20mA (max. load 200 Ohm) or

two-wire Modbus (EC28 B... only)

Alarm: Visual and audible 90dB @ 10cm (EC28 DA...only)

Relay output: 1 changeover, potential-free (EC28 ...R only) Vmax=30V AC/DC, maximum short-circuit current of supply source 1A

Power supplySupply voltage: 18…30V DC

Maximum fault voltage: 250V AC or 45V DC (see type plate)

Maximum supply current: 40 mA for EC28 & EC28 B

55 mA for EC28 D & EC28 DB

70 mA for EC28 DA & EC28 DAB

100 mA for EC28 DAR

Climatic parametersStorage temperature: 25...+60°C (short-term) / 0...+30°C (recommended)

Operating temperature (ambient): 20...+50°C (see also sensor specification)

Humidity range: 5...90% R.H. (see also sensor specification)

Atmospheric pressure range: 800...1100hPa (see also sensor specification)

EnclosureSensor mount: Stainless steel

Enclosure material: Antistatic plastic.

The enclosure must be protected against severe impact (> 4 J)!

Dimensions: 115mm x 203mm x 55mm (W x H x D)

Weight: approx. 800 grams (with display)

Type of protection: IP 64

Cable connector: Cable gland(s) M16 x 1.5 max. core cross-section 3(4) x 1.5mm2

Cable type and length: LIYCY 3(4) x 0.75 mm2 , 500m max. (200m max. for EC28 DA...) or

LIYCY 3(4) x 1.5mm2 , 1000m max.

Approvals and tests

Marking: II 2G 0158

Type of ignition protection: EEx em [ib] IIC T4 -20°C Ta +50°C

EC Type-Examination Certificate: BVS 04 ATEX E 132 X

Electromagnetic

Compatibility (EMC):

Compliant with DIN EN 50270 Disturbance emission: type 1

Interference immunity: type 2

33

Technical Data – Part 2

Transmitter types EC28i and EC28Di

Measuring function

Measured gas: Toxic gases and vapours and oxygen

Measuring range: See inspection record

Gas feed: Diffusion

Response time: See sensor specification

Measuring principle: Electrochemical

Anticipated sensor life: See sensor specification

Output signal: 4...20mA

for Ex zone: max. load 100 Ohm with Zener barrier,

see Accessories section

not Ex zone: max. load 200 Ohm without Zener barrier

Power supplySupply voltage: 15...30V DC for inherently safe supply Vi 30V

21...27V DC for supply via Zener barrier, see Accessories section

Maximum supply current: 25 mA

Climatic parametersStorage temperature: 25...+60°C (short-term) or 0...+30°C (recommended)

Operating temperature (ambient): 20...+50°C (see also sensor specification)

Humidity range: 5...90% R.H. (see also sensor specification)

Atmospheric pressure range: 800...1100hPa (see also sensor specification)

EnclosureSensor mount: Stainless steel

Enclosure material: Antistatic plastic.

The enclosure must be protected against severe impact (> 4 J) !

Dimensions: 115mm x 203mm x 55mm (W x H x D)

Weight: approx. 800 grams (with display)

Type of protection: IP 64

Cable connector: Cable gland(s) M16 x 1.5 max. core cross-section 3(4) x 1.5mm2

Cable type and length: LIYCY 2 x 0.75 mm2 , 500m max. or LIYCY 2 x 1.5mm2 , 1000m max.

Approvals and Tests

Marking: II 1G 0158

Type of ignition protection: EEx ia IIC T4 -20°C Ta +50°C

EC Type-Examination Certificate: BVS 04 ATEX E 132 X

Electromagnetic

Compatibility (EMC):

Compliant with DIN EN 50270 Disturbance emission: type 1

Interference immunity: type 2

Technology

for Man and Environment 207-000.34_OM_EC28.doc Version: 24 April 2007

from Firmware Version 2.3 Subject to changes

GfG Gesellschaft für Gerätebau mbH

Klönnestr. 99, D-44143 Dortmund, Germany

Telephone: +49 / (0)231/56400 0

Fax: +49 / (0)231/516313

E-mail: [email protected]

Internet: www.gasdetection.biz

marketingassist

Rectangle

34

EC Type-Examination Certificate

35

GfG reserves the right to change part numbers, prices and/or technical information without notification. 7004-028 020508

1194 Oak Valley Drive, Suite 20 Ann Arbor, Michigan 48108 USA

Phone: (800) 959-0329 or (734) 769-0573 Fax (734) 769-1888

E-mail: [email protected] Website: www.gfg-inc.com

Documents

Transmitter Series EC 28 - | GfG Instrumentation [BGV B6 – previously VBG ... Transmitter may only be opened when the electrical power is switched off. If the transmitter is not